Pathologically, in a great part of the cases, the nests of melanocytes were confined to the upper half of the reticular dermis, 2/3 of SCN showed marked junctional activity.

• 病理上，大部分病例黑素细胞巢局限于真皮网状层的上半部；2/3的SCN可见到明显的交界活动性。